Drawing-machine.



T. M. LARSBN.

DRAWING MACHINE.

APPLICATION PILBD MAR. e, 1913.

1,088,91 O. Patented Mar. 3, 1914.

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DRAWING MACHINE.

APPLIUATION FILED MAR. e, 1913.

1,088,910. Patented Mar.3,1914.

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JM f Ma@ THOMAS M. LARSEN, OF BROOKLYN, NEW YORK.

DRAWING-MACHINE.

To all 'whom it may concern Be it known that I, THOMAS M. LAnsnN, a citizen of the United States, and residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Drawing- Machines, of which the following is a speciication, such as will enable those skilled in the art to which it appertains to make and use t-he same.

This invention relates to machines for drawing patterns or curves Yfor use in cutting sheet metal elbows, and the object thereof is to provide an improved machine of this class by means of which a sheet metal elbow of any desired angle may be cut and formed ot' two or more pieces as may be desired.

The invention is fully disclosed in the tollowing specification ot' which the accom panying drawings form a part, in which the separate parts of my invention are designated by suitable reference characters in each of the views, and in which- Figure l is a plan view of the central portion and operative parts of my machine; Fig. 2 a transverse central vertical sectional view on the line 2 2 of Fig. l; Fig. 3 a front view of the central part ot' the machine looking in the direction of the arrow 3 of Fig. 2; Fig. l a sectional view on the line 4 4: of Fig. 2 and on an enlarged scale; Fig. 5 a section on the line 5-5 of Fig. 2 and on an enlarged scale, and Fig. G a section on the line 6-6 of Fig. 2 and on an enlarged scale.

ln the practice ot my invention I provide a frame comprising abase plate a o't' any suitable material and the opposite side portions of which are provided with upright supports Z) and Vb2, the support b2 being at the front of the machine. The base plate a is also provided, on its opposite side portions, and within the supports b and b2 with longitudinal guides or tracks c and c2 in which is placed a longitudinally movable sheet supporting board d provided at the right hand side edge thereotl with a longitudinal gear cl2, and the gear (Z2 acts as a straight edge to line a sheet oi metal cl3, on which the elbow sections are to be drawn when said sheet o'l metal is placed on the Specification of Letters Patent.

Application led March 6, 1913.

Patented Mar. 3,1914.

Serial No. 752,264.

board el, and the said sheet of metal may also beheld on the said board by means of thumb tacks (Z4.

The support b is provided in the top por- .tion thereof with a vertically movable bearmg block e, and the support b2 with a corresponding vertically movable bearing block e2 of greater vertical dimensions than the bearing block e, and the position of these bearing blocks may be adjusted in the supports Z) and b2 by means of a well known screw adjustment, shown at e, and said supports b and 2) are each provided on their outer faces with a scale b3 only one of which is shown in Fig. 3, and by means ol which the exact positions of the said bearing blocks may be regulated.

A. shaft f is mounted transversely in the bearing blocks c and c2 and provided at its front end with a crank f2 and within the support b2 with a large gear f3 which meshes with a smaller gear f on a stub shaft f5 mounted in the bottom part of the bearing block e2, and the stub shaft f5 is provided with a gear f similar to the gear f, and mounted in the bottom portion oit the support b2 is another stub shaft g provided with a gear g2 similar to the gears f3 and f, and the gear g2 meshes with and operates in connection with the longitudinal gear Z2 on the board l i'or the purpose of moving said board longitudinally of the machine.

Mounted centrally or between, the supports Z) and 'b2 are two guide rods 7L arranged in a horizontal plane, and these rods are supported at one end in the back support and at the other iu a yoke-shaped bracket h2 connected with the support b2.

lvlounted on and movable longitudinally of the guide rods tis a block 71 the front end portion oi' which is provided with a central longitudinal slot 2 in which is mounted a longitudinally movable block 113 having a depending tubular shell fi* provided at its lower end with a detachable head 5 having a set screw i and adapted to serve as a holder' for a pencil or scriber if, and within the shell @"1 is placed a spring i which bears on the end of the pencil or seriber 7, and with this construction the position of said pencil or scriber in its holder may be adjusted as will be readily understood. The block 3 which is movable longitudinally of the block is provided with a screw 0 having a thumb nut lo and by means of which the position of the block 3 in the block may be adjusted and the pencil or scriber 7 correspondingly adjusted. ln the rear end portion of the block and centrally thereof and between the guide rods h` is secured a vertical pin the upper end of which is screw threaded and provided with a nut y?,`

but the pin j may be secured in the block in any desired manner. The upper end of the pin fits in a recess jg in the lower end of a plate having a central longitudinal slot 752 through which the shaft f passes, and passed through the end of the pin is a lock pin j4 by which the plate 7a is connected with the pin y' and on which the plate if: is free to turn or rock.

Mounted on the rear side of the plate 7s and having a sliding tongue and groove connection therewith is an oblong supporting plate m the top and bottom ends of which are provided with keepers m2 in which is mounted a rotary disk n having a central oblong slot n2 through which the shaft f passes, and said disk is connected with said shaft by means of a pin a7 passed through said shaft and having a rotary bearing in the opposite side walls of the vslot n2, or said pin may be fixed in the disk fn, and have'a rotary or other movement on the shaft f. On the rear side of the supporting plate m is a semi-circular scale plate or protractor 0 which is rigidly secured to the rotary disk a at 02, and this protractor is provided witha segmental slot 03, and a pin 04 is passed through the shaft j and through the protractor 0 and provided with a thumb nut 05 by means of which the protractor 0 may be adjusted into the desired position.

The protractor 0 is provided with a scale p representing degrees from Zero to 900, and the shaft y is cut out at 222 to serve as a pointer in the adjustment of the protractor 0, and with this construction and with the protractor 0 in the position shown in F ig. L), the turning of the shaft f by the crank f2 will result in moving the board d longitudinally of the machine and straight line will be drawn on the sheet- CZS by the pencil or scriber 7, as shown at x, in Fig. l, but if the protractor 0 be set at any degree between Zero and 450 and the shaft f be turned they pencil or scriber- 7 will draw a curved line, as shown at m2 in F l, the extent or radius of said curved line being determined by the degree at which the protractor 0 is set. Y

The exact method of procedure will be best understood by giving an example. Suppose that it is desire/l to form an elbow of 90". lt is first necessary to determine how much extension the separate members of the elbow must have for the purpose of making the pipe connect-ions, in order to de.

termine at what distance the pencil or scriber 7 is placed from the straight edge gear Z2 in beginning the operation of makingv the curve, and it will be understood that this point is fixed at the end of the board at which the curve is begun. Wlith this point determined, if it is desired to make an elbow of 900 and consisting of two parts, the protractor 0 will be set at 450, and with the board l at the limit of its movement to the right, the crank f2 is turned and a curved line similar to 002 will be drawn on the sheet d3, it being understood that the exact radius of this curved line would be such that when` two sections of the sheet da were thus marked out, said sheets folded and connected in the usual manner would produce an elbow of 900. Suppose it is desired to make an elbow of more than two parts, the following rule is followed: If the elbow is to be composed of l0 parts, I multiply l() by 2 and subtract 2 from the product which gives 18. This remainder is then divided into the desired angle of 90C which produces a quotient of 50. The protractor will then be set at 50,

and l0 pieces may be marked out on the sheet or sheets Z3 in the manner hereinbefore described, and when said pieces are cut from said sheet they are connected in the usual manner to form an elbow of 90o composed of 10 arts.

It will be understood that the above rule is followed in all cases where it is desired to make an elbow of more than two parts and of an angle of anydesired degree, said rule being briefiy as follows: Multiply the number ofV sections by two, subtract two from the product7 and divide the remainder into the angle of the elbow to be produced,

and the result will determine where the proor decreased by adjusting the bearing blocks e and e2 and changing the guidewheel f6l to suitsaid adjustment. The pin y has a rotary movement in the block 2', and it Vwill be understood that the protractor 0 is always locked to the shaft f by means of the thumb nut 0"", and when the shaft f is turned the protractor o and the disk n both turn therewith, and'this gives a gyrating movement to the plate 7u, and this results in the curve m2 being drawn on the sheet da. Anysuitable marker may be substituted for Vthe pencil or scriber 7, and my invention is not limited to the use of the metal sheet d3, as the curves may be drawn on paper and transferred to a metal sheet if desired, and any suitable support for the block i may be substituted for the rods h, and otherl changes :in and modifications of the construction herein described may be made, within the scope of the appended claims without departing from the spirit of my invention or sacrificing its advantages. The protractor o cannot be used beyond the angle of and the farthest said protractor can be turned through the shaft f in the direction of the arrow ma in t-he use of the machine, is indicated in Fig. 2 by the dotted line as* which indicates the position of the disk n when said protractor is set at d50, and this is the degree at which the protractor is set in making an elbow of 90o and consisting of two parts. In making an elbow of more than two parts, the protractor must be set at less than 45o. In making an elbow of over 90o more than two parts are employed and the protractor must be set between Zero and 115, the articular degree at which it is set depen ing on the number of parts employed in the elbow. y

Having fully described my invention, what I claim as new and desire to secure by Letters Patent isz-- l. In a machine of the class described, a frame comprising a base provided at its opposite sides with uprights, a sheet support movable longitudinally on said base, a transverse support arranged over the sheet support, a marker support movable longitudinally on said t 'ansverse support, a shaft mounted in said uprights and over said transverse support, and means whereby the turning of said shaft will move the sheet support longitudinally of the frame and the marker support transversely of the frame.

2. In a machine of the class described, a frame comprising a base having opposite side uprights, a sheet support movable longitudinally on said base, a transverse support mounted between said uprights, a marker holder movable longitudinally on said transverse support, a shaft mounted in the top portion of said uprights, a plate connected with the marker holder and provided with a central slot through which said shaft passes, a support connected with said plate, a rotary disk mounted on said support, a protractor connected with said disk and passing through said shaft, and means whereby the turning of said shaft will move the sheet supportlongitudinally of the frame.

3. In a machine of thecclass described, a frame comprising a base provided at its opposite sides with uprights, a transverse support mounted between said uprights, a marker holder movable longitudinally on said transverse support, a sheet support movable longitudinally of the base, a shaft mounted in said uprights and over the transverse support, and means whereby the turning of said shaft will move the sheet supi' port longitudinally of the base, a protractor mounted in the said shaft centrally thereof and adjustable therein into different positions, a plate connected with the marker holder by a universal joint and provided with a central slot through which the said shaft passes, a support connected with said plate and a disk connected with the protractor and rotatable in said support, said shaft being passed centrally through said support and said disk, and being loosely connected with said disk.

4. In a machine of the class described, a base, a sheet support movable longitudinally thereof, a marker holder supported above the base and movable transversely of the machine, a shaft mounted above the marker holder, and means whereby the turning of said shaft will move the sheet support longitudinally of the base and the marker holder transversely thereof.

5. In a machine of the class described, a frame, a marker holder movable transversely thereof, a shaft, a slotted plate connected with said marker holder' by a universal joint and through which the shaft passes, a support connected with said plate, a rotatable disk connected with said support and provided with a large cent 'al opening through which the shaft passes, a protractor connected with said disk and passing through a central longitudinal slot in said shaft, and means for adjusting said protractor in said shaft.

(i. In a machine of the class described, a frame comprising a base and upright side supports, a sheet support movable longitudinally of the base, a marker support, a holder mounted on said marker support and movable transversely of the base, a shaft mounted over the marker support and provided with vertically adjustable end bearings, a large gear wheel mounted on one end portion of said shaft, a stub shaft mounted in the bottom part of the corresponding bearing and having a small gear meshing with the gear on said shaft, and another gear mounted on said stub shaft and geared in connection with the sheet support, and means whereby the turning of said shaft will move the marker holder transversely of the machine.

7. In a machine of the class described, a sheet support movable longitiulinally of the machine, a marker holder movable transversely of the machine, a main shaft mount ed in the top portion of the machine and having vertically adjustable end bearings, one of said end bearings being provided in the bottom part thereof with a stub shaft as my invention I have .signed my name in having a small gear meshing with a large presence of the subscribing Witnesses this 10 gear on the main shaft, another gear on the 4th day of March 1913,

stub shaft in operative connection with said 5 sheet support, and means whereby the turn- THOMAS M LARSEN' ing of said main shaft Will move the marker Vitnesses: holder transversely of the machine. C. MULREANY, In testimony that I claim the foregoing S. ANDREWS.

Copies vmi' this patent may be obtained for five cents each, by addressing' the Commissioner of Patente, Washington, D. C. 

